The placental barrier between the maternal and foetal blood is minimum in
Goat
Pig
Cow
Human
Mammalian eggs have
At what stage the primitive streak in the chick embryo is formed
$A$ : Failure of testes to descend into the scrotum causes sterility in man.
$R$ : Higher internal body temperature is not suitable for sperm development.
Follicular phase is also called
Signals from fully developed foetus and placenta ultimately lead to parturition which requires the release of